Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
hang tai » hang va, dung tai
hang hai » hoang hai, thanh hai, hang va
nang ma » tang ma, sang ma, nang cao
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
su sai » su tai, su hai, su dai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang ma hoi. hieu ((ve nam) or (le nam)) thuc dan ((hang hai) OR (hang tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ma hoi. hieu ((ve nam) OR (le nam)) thuc dan ((hang hai) OR (hang tai)) cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ma hoi. hieu ((ve nam) or (le nam)) thuc dan ((hang hai) OR (hang tai)) cua viet*".